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Jeffrey William Monson is an American-born Russian mixed martial artist, boxer, and submission grappler who competes primarily in the heavyweight division. A professional competitor since 1997, he has competed for the UFC, Strikeforce, DREAM, PRIDE, M-1 Global, Impact FC, World Victory Road, and Cage Warriors.

Call Sign: Aldan
2025
5.9UFC 61: Bitter Rivals
2006
6.3UFC 59: Reality Check
2006
6.5UFC 57: Liddell vs. Couture 3
2006
6.5UFC 27: Ultimate Bad Boyz
2000
5.0Pride 34: Kamikaze
2007
6.6UFC 35: Throwdown
2002
4.2DREAM 8
2009
6.9UFC 65: Bad Intentions
2006

Submission Underground 2
2016
6.5UFC 29: Defense of the Belts
2000
5.5Strikeforce World Grand Prix Quarter-Finals: Overeem vs. Werdum
2011